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  1. #1

    99 yamaha 1200 with overheating problems

    I have a 99 waverunner 1200 that has a overheating issue. I replaced the sensor (new cost $ 250) and put it in, as it ran 2 hours, and the darn thing shows overheating again!! GRRR What's next - making the sensor fail twice now?


  2. #2
    Try not to smile on a Jetski... GPRFrank's Avatar
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    Overheat

    I would pull out the stinger pipe and check the cat.and see if it maybe broke apart and clogging up exhaust! While its out replace the cat with a D-plate and remove sensor and install a chip (resistor) in place of it...My 2 Cents

  3. #3
    Mpeavler's Avatar
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    There is not CAT in the 99...it's the non-PV engine. it sounds like your engine /line has a clog somewhere not allowing the water to flow freely. I would pull the line from the exhuast manifold and back flush to see if something comes out. If it does...then likley your issue. The water should flow freely out of the pump. If you find nothing then you need to pull the head apart and look inside your cylinders. Does water come out the pisser nicely?

  4. #4
    OK will check today

    Thanks

  5. #5
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by Mpeavler View Post
    There is not CAT in the 99...it's the non-PV engine. it sounds like your engine /line has a clog somewhere not allowing the water to flow freely. I would pull the line from the exhuast manifold and back flush to see if something comes out. If it does...then likley your issue. The water should flow freely out of the pump. If you find nothing then you need to pull the head apart and look inside your cylinders. Does water come out the pisser nicely?
    i think he has a 99 xl1200 not a gp1200 ---then it is a pv motor

  6. #6
    Yes it is an XL - thanks. It does shoot water up just fine. How about if a couple of riders were running it very slow? will that make it overheat? It seems to go great when you're running it hard!

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